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Internal voids and pores are common structural defects in paper forming. Unreasonable fiber matching, uneven pulp dispersion and unstable pressing pressure will produce a large number of tiny internal voids, which seriously reduce paper density, surface fineness and physical strength. Excessive voids will cause ink penetration in printing, resulting in fuzzy patterns and poor color saturation, and also reduce paper stiffness and compression resistance, making packaging paper unable to bear stacking pressure. Traditional process adjustment cannot uniformly fill micro voids, and simply increasing pressing force will cause fiber damage and paper brittleness. Shandong Ludao Energy Technology Co., Ltd. launches professional paper internal structure optimization solutions. By optimizing fiber gradation and adopting high-efficiency filling and compacting technology, we effectively fill micro pores inside the paper, improve structural compactness and uniformity, and enhance paper surface fineness and printing presentation effect. The solution balances compactness and air permeability, improves paper comprehensive physical performance, and eliminates quality risks such as ink penetration and insufficient compression resistance.